Change spacing when using ctrl to move specific amount of units
While moving/rotating/scaling press Ctrl+Shift to transform by 0.1 of blender unit.


You may do the same thing as above but without holding Ctrl button enabling the Snapping Tool (just click on the magnet icon and set the snap element type to Increment). Hold down the Shift button while moving/rotating/scaling to transform by 0.1 of blender unit.